Fix "Error: Cannot find module" in Node, Next.js & Cursor projects

Quick answer: A package isn't installed, the import path is wrong, or the file name casing differs.

Error: Cannot find module

Why it happens

A package isn't installed, the import path is wrong, or the file name casing differs. It's one of the most common errors in AI-generated projects because AI tools often add imports or packages without updating your install or config.

How to fix it

1. Run npm install (or pnpm/yarn install) in the project root.
2. If it's a package, install it: npm install <name>.
3. If it's a local file, check the relative path and exact capitalization.
4. Delete node_modules and package-lock.json, then reinstall if it persists.

Prompt to paste into your AI tool

I got this error: "Error: Cannot find module". Before changing any code, explain the root cause in 2 sentences, list the files involved, then propose the smallest fix.

Still stuck? Paste your exact error into the free Error Fixer.